ON THE MEASUREMENTS OF WAVE-LENGTHS 
113 
The Spectrum of Tin. 
Scale- 
numbers. 
Description of lines. 
Wave¬ 
lengths. 
Remarks. 
12-20 
Strong, very short. 
4584-3 
The lines 335F8 and 3282'9 are 
15-18 
Weak, discontinuous, fine ..... 
4524-0 
short and very broad, with a 
25-93 
Weak, very short. 
4324-6 
strong nimbus, so that they 
32-50 
Weak, very short. 
4215-3 
have a somewhat nebulous 
42-93 
Weak, short, fine. 
40570 
appearance. In a less degree 
49-75 
Fairly strong, very short. 
3961-8 
this remark also applies to 
50-88 
Weak, discontinuous. 
3947-0 
the lines 2657'9, 2643'2, and 
53-92 
Strong, very short. 
3906-6 
263F5, and to several other 
57-62 
Strong, very short. 
3859-0 
lines in this spectrum de- 
62-40 
Strong, continuous, extended, fine . . 
3800-3 
scribed as very short. 
63-80 
/ Strong, very short. 
3783-4 
64-29 
[ Strong, very short. 
3779-0 
65-55 
Fairly strong, very short. 
3763-9 
67-15 
Vert strong, very short. 
Strong, very short. 
3745-1 
68-10 
3734-4 
68-40 
Fairly strong, very short. 
3727-0 
70-50 
Strong, very short. 
3707-6 
72-36 
Weak, very short. 
3686-7 
74-15 
Weak, very short. 
3667-6 
75-23 
Weak, discontinuous, fine. 
3655-5 
78-19 
Faint, very short. 
3623-9 
78-90 
Faint, vei-y short. 
3616-9 
79-80 
Strong, very short ....... 
3609-3 
80-60 
Very strong, very short. 
3598-3 
83-12 
Strong, very short. 
3574-0 
85-50 
Fairly strong-, very short ..... 
3549-7 
86-57 
Faint, very short. 
35393 
89-13 
Faint, very short. 
3514-8 
92-08 
Faint, very short, fine. 
3487-3 
93-83 
Weak, very short. 
3471-1 
100-35 
Strong, short. 
3412-7 
102-88 
Faint, very short. 
3390-4 
107-51 
Vert strong, short, extended, broad, 
110-25 
112-21 
116-03 
with a nimbus. 
Vert strong, continuous, fine . . . 
Weak, short. 
Vert strong, short, broad, with a 
nimbus extended. 
3351-8 
3330-0 
3314-6 
3282-9 
Avery characteristic group. These 
lines with those at 3174'3, 
3033T, 3007’9, are the prin¬ 
cipal lines in this spectrum. 
118-83 
Vert strong, continuous, extended, fine 
3261-6 
J 
120-89 
Weak, very short. 
3245-0 
124-14 
Faint, very short. 
3219-6 
124-62 
Faint, discontinuous. 
3218-0 
130-70 
Vert strong, continuous, extended, fine 
3174-3 
135-50 
Weak, discontinuous, fine. 
3140-6 
138-24 
Weak, very short. 
3122-3 
139-50 
Faint, very short. 
3131-0 
142-31 
Faint, very short. 
3095-2 
146-12 
Strong, very short. 
3070-6 
150-06 
Weak, discontinuous. 
3046-5 
152-18 
f Vert strong, continuous, extended, fine 
3033 1 
156-29 
[Vertstrong, continuous, extended,fine 
3007-9 
173-05 
Weak, continuous, faint in centre . 
2911-9 
176T8 
Strong, very short. 
2895-0 
177-80 
Strong, very short. 
2886-9 
179-50 
Weak, very short. 
2877-4 
180-07 
Faint, very short. 
2874-7 
MDCCCLXXXIV. Q 
